Last month we upgraded our seats from economy to what United calls Economy Plus. We did it at the last minute, just a couple of days before departure, and it cost $400 extra round-trip for both of us, between ORD and PRA. According to the website Donna linked to, it costs more to upgrade in advance and less if you do it at the last minute, as we did. But you're taking a chance on availability if you wait.

Thanks, fleg. My question was prompted by seeing your post which included the $400 upgrade. Thanks for the info regarding upgrades at the last minute.

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